Nouns denoting natural phenomena

a storm blowing from the northeast
a cloud of solid or liquid particles in a gas
snow mist
small crystals of ice
medium wave
a radio wave with a wavelength between 100 and 1000 meters (a frequency between 300 kilohertz and 3000 kilohertz)
magnetic line of force
a line of force in a magnetic field
beta rhythm
the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz
infrared emission
electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves
optical phenomenon
a physical phenomenon related to or involving light
light during the daytime
an especially luminous meteor (sometimes exploding)
specific heat
the heat required to raise the temperature of one gram of a substance one degree centigrade
(biology) the existence of two or more forms of individuals within the same animal species (independent of sex differences)
a strong downward air current
very light rain; stronger than mist but less than a shower
a single pulsation of an oscillation produced by adding two waves of different frequencies; has a frequency equal to the difference between the two oscillations
precipitation of ice pellets when there are strong rising air currents
infrared ray
a ray of infrared radiation; produces a thermal effect (as from an infrared lamp)
light air
wind moving 1-3 knots; 1 on the Beaufort scale
a turning force produced by an object acting at a distance (or a measure of that force)
neutron radiation
radiation of neutrons (as by a neutron bomb)
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